LAMP Additive Composition for Reducing Threshold Time
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Solution Overview
Problem
Current Loop Mediated Isothermal Amplification (LAMP) reactions face challenges with non-specific background amplification and variable threshold times, making it difficult to reliably detect low-copy templates and differentiate between positive and negative samples.
Innovation Solution
The use of additive compositions comprising ethylenediaminetetraacetic acid (EDTA), ethylene glycol tetraacetic acid (EGTA), bovine serum albumin (BSA), dimethyl sulfoxide (DMSO), and nonionic surfactants or polymers, either individually or in combination, to reduce threshold time and minimize template-independent background amplification in LAMP reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LAMP reaction is performed with high amplification efficiency, then DNA amplification speed is improved, but template-independent background amplification increases
Solution Approach 1:
The patent introduces specific additives (BSA, DMSO, nonionic surfactants, or polymers) as intermediary substances that mediate between the DNA polymerase and the reaction components. These additives selectively inhibit template-independent background amplification while preserving template-dependent specific amplification, thereby resolving the contradiction between high amplification efficiency and background noise.
Solution Approach 2:
The patent optimizes reaction conditions by adjusting parameters such as additive concentrations (0.1-5% BSA, 0.1-10% DMSO, 0.01-1% nonionic surfactants, or 0.1-5% polymers), Mg2+ concentration (1-10 mM), and reaction temperature (60-70°C). These parameter changes enable the system to achieve fast amplification while suppressing background signals through precise control of the reaction environment.
2Measurement precision
If LAMP reaction time is extended to detect low-copy templates, then detection sensitivity is improved, but negative samples begin to amplify resulting in false positives
Solution Approach 1:
The patent applies preliminary anti-action by incorporating additives that preemptively suppress template-independent amplification before it can occur. By adding BSA, DMSO, nonionic surfactants, or polymers to the reaction mixture, the system pre-establishes conditions that prevent background amplification from occurring during extended reaction times, thereby maintaining reliability while enabling detection of low-copy templates.
Solution Approach 2:
The additives serve as intermediary substances that create a selective environment favoring specific amplification while inhibiting non-specific amplification. This intermediary action allows the reaction to proceed for extended periods to detect low-copy templates without generating false positives from negative samples.
3Speed
If single additive is used to accelerate LAMP reaction, then reaction speed is improved, but non-specific background amplification problem remains unsolved
Solution Approach 1:
The patent employs composite material strategies by combining additives with different functional properties. BSA provides protein protection and stabilization, DMSO enhances primer annealing and reduces secondary structure formation, nonionic surfactants prevent non-specific binding, and polymers modulate reaction kinetics. The synergistic interaction of these composite additives accelerates specific amplification while suppressing background amplification more effectively than single additives alone.
Data Source
AI summary
An additive composition used in a loop mediated isothermal amplification (LAMP) reaction for reducing a threshold time for a positive sample includes but not limited to EDTA, EGTA, BSA, DMSO, nonionic surfactants, and polymers, and the additive composition used in LAMP reactions includes at least one of the above mentioned additives and may be any combination use of the additives.